For how long before that spring gives up holding a heavier valve at a higher lift? It may be fine for a street car that rarely sees redline but every so often on the street or drag strip, it's another for a track car that's always at redline...Gen 2 can rev as high as the boss if using the boss or Cobra Jet manifold and vct is tuned correctly.
Stock cams, Upgraded valve springs, Kooks Long tubes, 3" kooks exhaust, GT 350 IM PORTED heads.M-6550-M50BEXH and M-6550-M50BINT are the cams that come stock in the gen 2 coyote. These were the boss cam upgrade from frpp. 13mm lift 263 duration. Still haven't seen anyone just do ported heads with stock cams to see how they do. Not saying that any other cams don't out perform them, just upgraded cams aren't as high as previous cams because the stock ones aren't terrible to begin with.
So stock always means bad? I can see those engines being reved up to 8000 with GT350 mani all over the place - if anything fails it would be OPG or CS so you better invest some money here. Chains were also upgraded in S550.Well the problem with the Boss 302 springs is that they are still production springs. While it is still an upgrade from the stock Gen 1 springs they still had different seat pressures I believe it was when JPC Racing tested them a while back. If I was going through the motor and adding cams with more duration and possibly larger lift, I would be looking into aftermarket springs. When you look into aftermarket springs you also might want to look into heavy duty secondary chains. When talking with Tim Eichhorn over at MPR Racing Engines he had suggested that I go with aftermarket secondary chains as well. It took him about a month and a half to get his first batch of secondary chains to market, but so far they have been flawless for me.
Cost? Quite honestly id love to see his setup with those ported heads and upgraded springs on a CJ intake and spin it to 8k+Why would you hassle to change the springs while still keeping the stock cams? :shrug:
It wont change a thing without cams - GT350 mani was already designed to deliver peak power at 7500 - you will never get there without cams with longer durationCost? Quite honestly id love to see his setup with those ported heads and upgraded springs on a CJ intake and spin it to 8k+
The cams would cost more than the cost of the CJ intake manifold.